Naomi has discovered the following TCP ports open on a system she wants to harden. Which ports are used for unsecure services and thus should be disabled to allow their secure equivalents to continue to be used?

$21$

$22$

$23$

$80$

$443$

Group of answer choices

A$.21,22,$ and $80$

B$.21$ and $80$

C$.21,23,$ and $80$

D$.22$ and $443$